package com.AICoupon.service.impl;

import cn.hutool.core.util.BooleanUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.AICoupon.dto.Result;
import com.AICoupon.entity.Shop;
import com.AICoupon.mapper.ShopMapper;
import com.AICoupon.service.IShopService;
import com.AICoupon.utils.CacheClient;
import com.AICoupon.utils.RedisData;
import com.AICoupon.utils.SystemConstants;
import org.springframework.data.geo.Distance;
import org.springframework.data.geo.GeoResult;
import org.springframework.data.geo.GeoResults;
import org.springframework.data.redis.connection.RedisGeoCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.domain.geo.GeoReference;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.util.*;
import java.util.concurrent.TimeUnit;


import static com.AICoupon.utils.RedisConstants.*;

/**
 * <p>
 *  服务实现类
 * </p>
 *

 */
@Service
public class ShopServiceImpl extends ServiceImpl<ShopMapper, Shop> implements IShopService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Resource
    private CacheClient cacheClient;
    @Override
    public Result queryById(Long id) {
        //缓存穿透
        Shop shop = cacheClient.queryWithPassThrough(CACHE_SHOP_KEY, id, Shop.class, this::getById, CACHE_SHOP_TTL, TimeUnit.MINUTES);
        return Result.ok(shop);
    }

    private boolean tryLock(String lockKey) {
        Boolean flag = stringRedisTemplate.opsForValue().setIfAbsent(lockKey, "1", 10, TimeUnit.SECONDS);
        return BooleanUtil.isTrue(flag);
    }
    private  void unlock(String lockKey) {
        stringRedisTemplate.delete(lockKey);
    }

    private void saveShopToRedis(Long id, Long expireSeconds) {
        Shop shop1 = getById(id);
        RedisData redisData = new RedisData();
        redisData.setData(shop1);
        redisData.setExpireTime(LocalDateTime.now().plusSeconds(expireSeconds));
        stringRedisTemplate.opsForValue().set(CACHE_SHOP_KEY + id, JSONUtil.toJsonStr(redisData));
    }


    @Override
    public Result update(Shop shop) {

        //1.先写数据库
        Long id = shop.getId();
        if (id == null) {
            return Result.fail("店铺id不能为空");
        }
        updateById(shop);
        //2.再删除缓存
        stringRedisTemplate.delete(CACHE_SHOP_KEY + id);
        return Result.ok();
    }

    @Override
    public Result queryShopByType(Integer typeId, Integer current, Double x, Double y) {
        if (x==null || y==null){
            // 根据类型分页查询
            Page<Shop> page = query()
                    .eq("type_id", typeId)
                    .page(new Page<>(current, SystemConstants.DEFAULT_PAGE_SIZE));
            // 返回数据
            return Result.ok(page.getRecords());
        }
        //1.计算分页参数
        int from = (current - 1) * SystemConstants.DEFAULT_PAGE_SIZE;
        int end = current * SystemConstants.DEFAULT_PAGE_SIZE;
        //2.查询redis、按照距离排序、分页查询
        String key = "shop:geo:" + typeId;
        GeoResults<RedisGeoCommands.GeoLocation<String>> results = stringRedisTemplate.opsForGeo()
                .search(
                    key,
                    GeoReference.fromCoordinate(x, y),
                    new Distance(5000),
                    RedisGeoCommands.GeoSearchCommandArgs.newGeoSearchArgs().includeDistance().includeCoordinates().limit(end)
        );
        if (results == null) {
            return Result.ok(Collections.emptyList());
        }
        List<GeoResult<RedisGeoCommands.GeoLocation<String>>> list = results.getContent();
        if (list.size() <= from) {
            //没有下一页了，结束
            return Result.ok(Collections.emptyList());
        }
        //截取from-end的部分
        List<Long> ids=new ArrayList<>(list.size());
        Map<String, Distance> distanceMap = new HashMap<>(list.size());
        list.stream().skip(from).forEach(result -> {
            //获取店铺id
            String shopIdStr = result.getContent().getName();
            ids.add(Long.valueOf(shopIdStr));
            Distance distance = result.getDistance();
            distanceMap.put(shopIdStr,distance);
        });
        //根据id查询shop
        String idStr = StrUtil.join(",", ids);
        List<Shop> shops = query().in("id", ids).last("ORDER BY FIELD(id," + idStr + ")").list();
        for (Shop shop : shops) {
            shop.setDistance(distanceMap.get(shop.getId().toString()).getValue());
        }
        return Result.ok(shops);
    }


}
